$re = '~>\s+<~';
$str = '<h4>Specifications</h4> <table> <tr> <td>Brand</td> <td>Dell</td> </tr> </table>';
$subst = "><";
$result = preg_replace($re, $subst, $str);
echo "The result of the substitution is ".$result;
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php